KitherRunner opened a new issue, #6653:
URL: https://github.com/apache/rocketmq/issues/6653
Topic Pattern change：
RocketMQ 4.x rocket-client：
// 重复的校验逻辑
org.apache.rocketmq.client.Validators#checkTopic、org.apache.rocketmq.common.topic.TopicValidator#validateTopic：
^[%|a-zA-Z0-9_-]+$
RocketMQ 5.x rocket-client-java：
org.apache.rocketmq.client.java.message.MessageBuilderImpl#TOPIC_PATTERN：
^[%a-zA-Z0-9_-]+$
What is the reason for not supporting "|" ?
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